UTI with high fever. 15 to 10 in total?

Diagnosed with UTI, ultrasound shows, fatty liver, fatty pancreas and possible but not sure residual right sided kidney pyelitis. I was first put on Oflox 20 for 2 days,l in the emergency dept, then went to OPD on Monday and was put on oflox 400 nifty 100 for 5 days twice a day with pan 40. Went back to the OPD on Thursday and was asked to continue with the same medicine for 10 more days although the UTI infection is much better. This would make my total medication days to 15. My issue is with the side effects, pain in ankles and knees and overall in my legs. Secondly, there is a lot of anxiety and am not sleeping for more than 5 hours every night. I am more concerned about the tendon damage in my ankles. Therefore I want to understand if I should make some alterations in the medicine or may be reduce the days from 15 to 10 in total?